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PARIS, FRANCE - JUNE 03: Dominic Thiem of Austria plays a forehand during his mens singles fourth round match against Kei Nishikori of Japan during day 8 of the 2018 French Open at Roland Garros on June 3, 2018 in Paris, France. (Photo by Aurelien Meunier/Getty Images)

PARIS, FRANCE - JUNE 03:  Dominic Thiem of Austria plays a forehand during his mens singles fourth round match against Kei Nishikori of Japan during day 8 of the 2018 French Open at Roland Garros on June 3, 2018 in Paris, France.  (Photo by Aurelien Meunier/Getty Images)